Smart Contract Hacking - Reentrancy (2022)

Reentrancy is a problem as old as solidity. The most infamous hack in Ethereum (the Dao Hack) triggered a lot of discussion on the subject back in 2016. But is it still relevant. Just last year the Burgerswap hack, SurgeBNB hack, and Cream Hack, all had a reentrancy exploit component.

In this video we evaluate the causes of reentrancy, we create our own contract with a reentrancy vulnerability so we can exploit it, and then we fixed it from three different paradigms.

00:00 - 02:14 Intro
02:14 - 14:17 The vulnerability
14:17 - 25:07 Exploiting the vulnerability
25:07 - 29:12 Creating a testing dashboard
29:12 - 30:17 Creating an innocent user contract
30:17 - 37:53 Fixing using especial transfer()
37:53 - 44:33 Fixing with check and effects pattern (best practice)
44:33 - 51:50 Fixing with non-reentrant modifier (mutex pattern)

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